Flexible auxiliary tread for pneumatic tires.



' meagre?.

CHARLES HGUNN, OF LNCOLN; CALIFORNIA. f-

FLEXIBLE AUXILIARY TREAD FOR PNEUMATXC 'IIRE Specification of Letters Patent.

Patented Apr. S, 1915).

Application filed May 15, 1917. Serial Ilo. 168,696.

` coin. in the county of Placer, State of Caliornia, have invented certain new and use- -ul lmprovements in Flexible Auxiliary Treads for Pneumatic Tires; and I do de-v clare the following to be a full, ele-ar. and exact description of the same, reference being hadto the accompanying drawings. and to the characters ot' riference marked thereon, which torni a partuof this amilication.

This invention relates to improvements iu treads for pneumatic tires. The object ot the invention is to produce au auxiliary tread to fit over lthe outer casing o'l a'pneumatie tire and. to stand the` wear ot' the road surface. lt is especially designed to tit lover usines, the side Walls of which are not worn out, lVith such auxiliary treads disposed over the casing, such casing will wear indefinitely andatthe Sametime will not be subjected to punctures, tread blow outs and the like. A. further object ot the invention is to provide an auxiliary rtread so it will be freely flexible in order to allow of the pneumatic tire Afunctioningr in the ordinary A further object of the invention is to 'produce a simple and inexpensive device `tive for the purposes for which it is (lesigned. l

These objects I accomplish by means ot' such structure and relative arrangement ot' parts as will t'ull.v appear bv a perusal ot' the following` specification and claim.

lu the drawings, similar characters ot reference indicate corresponding parts in the several views.

Figure .l is a side elevation otl a wheel carrying a pmiunratic tire. and showing my improved auxiliary tread installed thereon.

Fig'. 2 is a side elevation part-ly broken out and in section ot one ot' my improved tread sections.

Referring now more particularly to the characters ot rciicrence on the drawings my improved tread, is tirst made up prinrarily oli two endless cables l formed into rings, each being ot a diameter slightly less than the. outer diameter of the pneumatic casing over which the tread is to tit. The. tread properis then lmade up of a plurality of tread scctions, each section comprisingV an iron plato 2 curved in cross sccl ion to coliform' to the shape ot' the tread of the pneinnatic tire. The ends ol these iron plates *l are bent backwardly as at S sofas to extend around the cables 1 whereby all of the tread sections will bc held on the cables l. The wearing' pori ions are made up ot small blocks of canvas l vulcanized in lamiuatious ot' rubber 5 with a mass ot' vertical crimped Crucible stccl wires (3 embedded in the rubberized canvas. These wear strips are each provided witha transverse rivet 7 at each end thereof to reinforce the same and prevent them from spreading or 'splitting at the ends; Such strips are securely fixed t0 the iron members 2 b v means ot' rivets 8, which rivets S extend through the turnback portons' ot' the plates 2 at points above the rivets l'.- These rivets S hold the wear strips tixcd to the iron plates l and at. the salue time strengthen and reinforce them. The

wearing strips extend a considerable distance beyond the outer surfaces of the membels 3 so as to present the rubberized reinforced material to the wear of the road suie tace. The wear of the same is greatly minimized by the presence ot the Wires The sides ot the wear strips project beyond the sides ot the iron plates 2 so asvto lill in the intcrstices between the. same -whereby almost a solid surface is presented when one ot' my auxiliary treads is moiinted upon a pucunurtie tire..

lu order to apply my auxiliary tread to a pneumatic tire l first deflate the tire and then place my auxiliary tread over the same.` lipon the tire being inflated itl will tighten out against thc tread and hold the same in place.A ln order to make certain that the tread will not loosen from the casing pro vide an auxiliary cable t) which extends th ough elongated projections 1() on certain onlis ot' thc plates. This cable 9 is provided with a turn-luickle .ll t'or giving t-he same proper tension to insure the auxi1- iary tread l'rom being lost. or loosened from thc pneumatic casing.

The. eres tor the 'c-ablc I formed by the turn-back portions 3 against undue strain as the'cusiug' yields beinvention us set forth herein'.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detuil may be resorted to as do not form e departure from the spirit of the invention as defined by the appended claim.

. Having thus described my invention what I claim es newzind useful and desire to secure by Letters Patent is:

An auxiliary treud for pneumatic tires i comprising e plurality of independent tread I have produced Suche de-` vice us substzuitiully fulfils the object of the 4 sections, each treed section comprising einetellic plate curved to conform to the cross section ofthe tire and with its outer ends bentinwurdly for a certain distance to form a V, i4/Wearing block' carried on the plate und proJecting between' the V-shaped portions of the plete, the Wearing' block being secured to the plate by rivets passing through the block and the sides of th(` V- Vshaped portions of the plete, and transverse rivets through 'the Wearing block adjacent the securing` rivets whereby the weering` block is reinforced and prevented from splitting.

In testimony whereof, I affix my signeture in the presence of two Witnesses.

f CHARLES GU'NN. Witnesses: l c

W. M. SPARKS, J r., C. P. Mossen. f 

